MESSAGE_FLAG_VALID
fHeader->flags = MESSAGE_FLAG_VALID;
|| (fHeader->flags & MESSAGE_FLAG_VALID) == 0) {
|| (fHeader->flags & MESSAGE_FLAG_VALID) == 0) {
|| (fHeader->flags & MESSAGE_FLAG_VALID) == 0) {
fHeader->flags = MESSAGE_FLAG_VALID;
|| (fHeader->flags & MESSAGE_FLAG_VALID) == 0)